SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d56ecf9d210a065681c65718d16ff2a0c5cd37bcdae2c44c4883abbbdfb7fb5' 
  AND token = 'z78vM5D5kKUeThNZc4TFp1ATvr+GzzKdsiDta99CJdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables